Building a Privacy-First URL Shortener on Blockchain

Описание и применение

Создание приватного сокращателя URL с использованием клиентского шифрования и хранения на блокчейне Cronos, где сервер не видит целевой URL, устраняя отслеживание и уязвимости.

Задача

Traditional URL shorteners log user data, track browsing patterns, and sell data, creating privacy risks and single points of failure.

Результат

Cryptly provides a privacy‑first URL shortener where the server never sees the destination URL, eliminating tracking and single points of failure while leveraging blockchain for censorship‑resistance.

Рабочий процесс

• 1. User enters a URL in the client UI.
• 2. The browser generates a random IV and derives an AES‑GCM key via Web Crypto API.
• 3. The URL is encrypted client‑side and the ciphertext is sent to a Cloudflare Worker.
• 4. The Worker writes the ciphertext to the Cronos blockchain as immutable data.
• 5. The short link is returned to the user.
• 6. When the short link is visited, the browser fetches the ciphertext from the blockchain.
• 7. The browser decrypts the ciphertext locally using the same key and IV, revealing the original URL.
• 8. The browser redirects to the decrypted destination without exposing it to any server.

Доказательства

Encrypted URL stored on Cronos blockchain

Источник

Server never sees destination

Источник